Mujammi' bin Attab bin Shumayr narrated from his father: I said to the Prophet (peace and blessings be upon him): "I have an elderly (father) and some brothers. I will go to them; perhaps they will accept Islam and I will bring them to you." He (peace and blessings be upon him) said: "If they accept Islam, that is better for them, and if they stay (where they are), Islam is spacious and wide."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14499